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49 interview questions on Node.jsfor developers (2025)

Test your technical skills before an interview of Node.js with 49 corrected questions. Beginner, Intermediate or Expert level.

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49 questions
Expert
10 votes906 runs0 comment

How to define a global variable with Node.js?

Back-end developer
variables
node.js
Jean-marie Cléryat May 11, 2022
Medium
6 votes899 runs0 comment

Parse a query string into an object in NodeJS

Back-end developer
javascript
node.js
Jean-marie Cléryat May 11, 2022
Medium
4 votes886 runs0 comment

Which of these 4 solutions for serving a very large file will be the most optimized in terms of _server resources_ and _loading speed for the client_?

Back-end developer
nodejs
file
server
Jean-marie Cléryat May 11, 2022
Hard
3 votes979 runs0 comment

How to get the result of 3 asynchronous functions in NodeJS

Back-end developer
promises
async
javascript
Jean-marie Cléryat May 11, 2022
Hard
3 votes926 runs0 comment

A simple SocketIO chat server, coupled with Express.

Back-end developer
socket.io
websockets
Jean-marie Cléryat May 11, 2022
Hard
3 votes890 runs0 comment

Write a NodeJS server that returns a different message depending on the route.

Back-end developer
http
server
Jean-marie Cléryat May 11, 2022
Medium
2 votes907 runs0 comment

Which of the following is the odd one out? : npm, yeoman, webpack, babel

Back-end developer
nodejs
yeoman
Jean-marie Cléryat May 11, 2022
Hard
1 vote954 runs0 comment

What does a dependency marked as `^4.2.x` in the `package.json` mean?

Back-end developer
dependencies
semver
Jean-marie Cléryat May 11, 2022
Medium
1 vote935 runs0 comment

What will the `result` variable contain at the end of this code?

Back-end developer
promises
async/await
Jean-marie Cléryat May 11, 2022
Hard
1 vote933 runs0 comment

How to return an error and a result from an asynchronous function in NodeJS

Back-end developer
callback
error
Jean-marie Cléryat May 11, 2022
Medium
1 vote928 runs0 comment

Create a web server with Express(v4) and listening on port 3000

Back-end developer
express
node
Jean-marie Cléryat May 11, 2022
Hard
1 vote926 runs0 comment

Given a tree structure and Express middlewares, which file will be returned when calling the `tutorial.mp4` resource?

Back-end developer
express
static
Jean-marie Cléryat May 11, 2022
Medium
1 vote925 runs0 comment

Which of the following are Node templating engines?

Back-end developer
templating
Jean-marie Cléryat May 11, 2022
Hard
1 vote920 runs1 comment

Write a NodeJS program that logs the contents of a file.

Back-end developer
error handling
file system
Jean-marie Cléryat May 11, 2022
Hard
1 vote914 runs0 comment

Fix the following code:

Back-end developer
callback
this
Jean-marie Cléryat May 11, 2022
Easy
1 vote911 runs1 comment

What is the advantage of using mongoose over MongoDB.MongoClient to deal with a MongoDB database?

Back-end developer
mongoose
mongodb
models
Jean-marie Cléryat May 11, 2022
Easy
1 vote910 runs0 comment

How to add the `async` module to our project?

Back-end developer
npm
modules
Jean-marie Cléryat May 11, 2022
Expert
1 vote886 runs0 comment

Write a generator function in NodeJS that yields the numbers from 0 to infinity.

Back-end developer
generators
yield
Jean-marie Cléryat May 11, 2022
Easy
1 vote886 runs0 comment

Include a module in NodeJS

Back-end developer
modules
require
Jean-marie Cléryat May 11, 2022
Easy
1 vote881 runs0 comment

Import a function from an ES2015 module in NodeJS

Back-end developer
modules
import
export
Jean-marie Cléryat May 11, 2022